Motor-controlling device.



R. M. KLEIN & D. R: SPERRY.

MOTOR CONTROLLING DEVICE.

APPLICATION FILED MAR. 23, 1908.

925 108, Patented 511116151909.

8 SHEETS-SHEBT -l.

i g i 1 d JNS/EAZTUHS RICHARD zI l. KLEJAT.

1211/12.? R. SFEHHY I VZTNEEEES/ R. M. KLEIN & D. R. SPERRY.

' MOTOR CONTROLLING DEVICE.

APPLIOATION FILED MAR 23, 1908.

Patented June 15, 1909.

3 SHEETS-SHEET 2.

llk u JI I. KLEIN".

HEY. [11

DAVID E. PE

R. M. KLEIN & D. R. SPERRY.

MOTOR CONTROLLING DEVICE.

APPLICATION FILED MAR. 23, 1908.

Patented Junel5, 1909.

3 SHEETS-SHEET 3.

WITNESSES.

@MW K15 JNKENTUBE. RICHARD A LKLE'IN. v 114x027 R. SPERH'K AT TK I a reliable and e varied. The motor A RICHARD M. KLEIN DAVID CONSIN.

R. SP'ERRY, OF MADISON, NORTHERN ELECTRICAL MANUFACTURING COMPANY,

WISCONSIN, ASSIGNORS TO A CORPORATION or WIS- uo'ron-conmonnmo :onvzcn.

Specification of Letters Patent. v

Patented-Inna 15, 1909.

Application filed Inches, 1908. Serial No. 422,760.

To all whom it'may concern:

Be it known that we, RicHAR'n M. KLEIN and l)AVID R. SPERRY, citizens of the United States, residing at Madison, county of Dane, State of Wisconsin, have invented certain new and useful Improvements in Motor-Controlling Devices, of which the following is a specification.

This invention relates to devices for controlling electric motors and has for its-object the provision of means whereby a motor may be started, stop ed and regulated in speed in cient manner.

Our invention relates more specifically to the controlling of motors used in connection with automatic machines, the speed of which is to be automatically varied. It is particularly applicable to automatic machine tools in which the speed of a moving element is to be varied within a definite range as the element makes a redetermined movement.

One of the o hjects of our invention is to provide means whereby the rotating element of a machine, as for instance a cam shaft, will be varied from one s eed to another and back to the original spec during a complete revolution of the cam shaft.

Other objects of our invention will appear in the course of-the following speoificahon in which we have shown our invention embodied in concrete mechanisms for purposes of illustration.

Referring to the drawings, Figure 1 is a side elevation of a machine having our invention a plied thereto; Fig. 2 is an end elevation oi the same; Fig. ,3 is a sectional View of the mechanism for shifting the resistance; Fig. 4 is aside view of the same; and Fig. 5 is a diagram of the circuitconnections. Referring to the drawings, represents a machine tool, the speed of certain parts of which is tov be automatically varied. The particular machinetool herein shown is a screw machine adapted to be driven by, two

motors A and B. The motor A is for the main drive of the machine whereas the motor B is adapted to drive the cam shaft. In a machine of this type the niaindrive has a constant speed for a given work while the speed of the cam shaft is automatically in this case is geared shaft 11 and the motor 18 n the driving of the cam shaft it is not only necessary that it automatically change from one speed to another to drive the main the cam shaft 12.

, jecting fingers 24 and to be engaged and swing the arm 19 to ar the iesistance and vary the speed of the motor ated by means of projecting rotatable with and adjustable with reference to the cam shaft 12.

. is desired to produce is that for one but it is also necessary that the extent of the change or interval between the chan es be varied at will. In order to accomplish this change in speed, a rheostat 13 is arranged in circuit with the motor B referably 1n the field circuit. The control ing arm of this rheostat is operated by means of a connectingrod 14 secured at one end to an arm 15 ivoted at the central stud 16 of the rchostat.

he controlling arm is made adjustable with rel'ercnce'to the arm 15 b means of a handle 17 and a set screw 18 so t rat the arm may be left in any desired osition to vary the range of'movement of t :e controlling arm. The opposite end of the connecting rod 14 is pivoted to a rod 19 and is made adjustable by means of a sleeve 20, to which the arm is pivoted, and a set screw 21. This rod is secured to a rocker arm 22 rotatably. mounted in a bracket 23. This rocker arm has two proust The fingers are arranged to be actulugs 26 and 27 These lugs form the ends of arms28 and 29 pivoted centrally of the cam shaft and secured thereto b means j of a flanged member 30 with which t E be adjusted as shown.

iey may The engaging surfaces between the fingers an d the lugs are of involute shape so that throughout the range or contact there will be no rubbing but merely rolling friction. The result which it complete revolution of the shaft 12 a certain Sfififll will be maintained for a given portion oi the revolution and then automatically changed to another so that a predetermined speed shall be maintained for the remainin por} tion thereof. When the entire revol tion has been completed the s changed to the first speed.

It will be seen that when the cam shaft 12 rotates to a certain position in its revolution, the lug 26 will peed must again be which are ada ted on age the fingerZ l and carry it along for a (iel 'lll ite period, the surfaces 3 1 rolling u on each other. .The arm 28. having a longer radius than the finger 2a the surfaces will he disengaged after a definite length of travel. This movement of the finger 2 shifts the controlling arm of the rheostat a definite amount, depending upon the position of the sleeve 20 upon therod 19. he particular of the lug 27 engages the finger controlling'arm will be moved back to its original position. Thus for stud 38.

started and controlled.

part of the rheostat which the controlling arm moves over may be varied by the handle 17. vAfter the finger leaves the lug 26, the cam shaft continues to revolve at the changed speed until the engaging surface 32 25, and the a single rotation of the cam shaft the speed has been varied from the starting speed'to a predetermined speed and back again.

In Fig. 5 we have shown the arrangement of circuits whereby the motors A and B are The motor A is adapted to be started manually by means of a starting resistance 33, which is cut out by the spring-returned strating arm 34 and held in running position by the no-voltage magnet 35 in the usual way. The particular type of starting device used in starting this motor forms no art of'our invention but for purposes of il ustration we have shown a t pe of regulating rheostat shown and descri ed in a patent to F. J. Seabolt, No. 852,851. In this type of starter as the controlling mechanism 1s moved in a clockwise direction, the resistance is cut out of the armature circuit until running position is reached and upon mpvmg wise dlrection, field resistance is inserted to vary the speed of the motor. In this case the speed of the motor A is varied by means of the studs 36 as the arm is returned. When the starting arm reaches running position, the solenoid 37 is energized through When the solenoid actuates the controlling arm 39 ivoted at 40 against the retardation of the ash-pot 41 to cut out resistance 42 from the armature circuit of motor B, the latter is automatically started after motor A is brought up to running speed. The speed of the motor B is then automatically varied by means of the connecting rod 14 in the manner above described. The motor B may be stopped and started at an time by actuating t e push button 43. t will thus be seen that upon the closing of the line switch 44 the motor A will be'started and brought up to running speed at which point the motor B will likewise be automatlcally started and brought to its running speed, which speed will depend upon the position of the controlling arm 15 of the rheostat. The speed of the motor A. may then be varied at will by means of the resistance 36.

While we have described our invention as adapted to a particular form of mechanism and arranged to operate in a certain s ecific way, it should be understood that we 0 not limit our invention to the particular construction, arrangement and application herein shown and described except in so far as it is limited by the scope of the claims annexed hereto.

the mechanism in a counter-clock-- .for automatically starting the other of said a revolution of said element.

What we claim as new and desire to secure by Letters Patent of the United States, is, 1 The combination with an electric motor driven machine, of means for automatically varying said motor from one operating speed to another and back again during a predetermined movement of said machine.

2. The combination with the rotatingelement of a machine and an electric motor for driving the same, of means for automatically varying said motor from one operating speed to another and back again during a revolution of said member.

3. The combination with the rotating element of a machine and an electric motor fordriving the same, of means for automatically var ing said motor from one speed to another an back again during a revolution of said element, and means for changing the range of said speed variation.

4. The combinationwith the rotating element of a machine and an electric motor for driving the same, of means for. automatically varying said motor from one speed to another and back again during a revolution of said element, and means for changing the position at which the speed is varied.

5. The combination with the rotating element of a machine and an electric motor for driving the same, of means for automatically varying said motor from one speed to another and back again during a revolution of said element, means for changing the-position at which the speed is varied, and means for changing the range of said speed variation.

6. The combination with a machine having independently actuated cooperating elements, of an electric motor for driving each 0t said elements, a manually operated starting device for one of said motors, and means motors when the manual starting device reaches a predetermined position.

7. The combination with an electric motor driven machine, of an automatic starting device for said motor, and means for automatically varying said motor from one operating speed to another and back again during a predetermined movement of said machine.

8. The combination with the rotating element of a machine and an electric motor for driving the same, or" an automatic starting device for said motor, and means for automatically varying said motor from one operating speed to another and back again during 9. The combination with a machine having independently actuated cocperating elements, of an electric motor for driving each of said elements one of which rotates at a constant speed, and means for automatically varying the other of said motors from one speed to another and back again during a predetermined movement of the element driven by said second motor.

10. The combination with a machine having independently actuated cooperating elements, of an electric motor for driving each of said elements one of which rotates at a constant s ed, and means for automatically va rying t e other of said motors from one speed to another and back again during a rotation of the element driven thereby.

11. The combination with a machine tool having independently rotated coo rating elements, of an electric motor for eacii of said elements one of which rotates at a constant speed, a rheostat in circuit with the other m0- tor, and means for automatically varying the resistance in said rheostat to cause the motor to rotate at one s ed during a portion of a revolution of the e ement driven thereby and at a different speed during the remainder of said revolution.

12. The combination with a machine tool having independently rotated coo rating elements, of an electric motor for eac of said elements one of which rotates at a constant speed, a rheostat in circuit with the other motor, means for automatically varying the resistance in said rheostat to cause the motor to rotate at one speed during a portion of a revolution of the element driven thereby and at a different speed during the remainder of said revolution, and means for changing the range of said resistance variation.

13. -The combination with a machine tool having independently rotated (:06 rating elements, of an electric motor for eac of said elements one of which rotates at a constant speed, a rheostat in circuit with the other motor, means for automatically varying the resistance in said rheostat to cause the motor to rotate at one speed during a portion of a revolution of the element driven thereby and at a different speed during the remainder of said revolution, means forchanging the range of said resistance variation, and means for elements, of an electric motor for each of said elements, a starting device for one of said motors, an automatic device for starting the other of said motors arranged to be operated when said first starting device reaches running position, a rheostat for varying the speed of said second motor, and means for actuating said rheostat to cause the motor to rotate at one speed during a portion of a revolution of the element driven thereby and at a different speed during the remainder of said revolution.

15. The combination with a machine tool having independently rotated cooperating elements, of an electric motor for each of said elements, a starting device for one of said motors, an automatic device for starting the other of said motors arranged to be operated when said first starting device reaches running position, a rheostat for varying the speed of said second motor, means for actuating said rheostat to cause the motor to rotate at one speed during a portion of a revolution of the element driven. thereby and at a different speed during the remainder og saidt revolution, and means for changing theposi:

tion at which the speed is varied.

In witness whereof, we have hereunto set our hands this 9th day of March, 1908.

RICHARD M. KLEIN. DAVID R. SPERRY.

Witnesses:

A. J. BUENZLI, J. W. FRENZ. 

